coupling caps comparison

[pula58]

Polypropylene Xicon MPP's vs. Orange drop "PS" series" vs. Mallory 150 series.

Which do you suppose has the sweetest (non-harsh) high-end?

In a Fender AB763 circuit, which particular caps would affect the high end the most?

Thanks!

P.

[Structo]

both the PS and 150 are Mylar or polyester.